[tor-dev] Add EVENT message to pt-spec.txt and control-spec.txt

[David Goulet]

Greetings tor-dev!

We've been working on improving PT reporting towards Tor so for instance Tor
Browser can better inform the user or take actions based on the PT state when
connecting to the network.

The following ticket summarize it:
https://trac.torproject.org/projects/tor/ticket/28180

To achieve this, we are submitting these to torspec.git patches to extend both
the pt-spec.txt and control-spec.txt to support such mechanism. This is the
first draft.

Below is the link to the PT spec patch. It adds the EVENT message that for now
is only used, as you will see, for reporting connection status message.
However, you should see this EVENT message as extendable to whatever the PT
would like to report to Tor that we can think of in the future:

https://gitweb.torproject.org/user/dgoulet/torspec.git/commit/?h=ticket28181_01&id=0814114fb39f9f7ddf16de35f97092ed74ffd1ee

The second, is simpler, it is how Tor will send it back to the control port:

https://gitweb.torproject.org/user/dgoulet/torspec.git/commit/?h=ticket28182_01&id=b57d272f570847cdcf073b5fdf5b523d3f57d889

Please, any questions or feedbacks is very welcome! The main idea here is to
keep things simple and extendable.

Note that since Tor doesn't implement the PT 2.0 spec yet, we haven't done
anything for that spec but after skimming the version 2, I think we can easily
move this EVENT message concept if we want it.

Cheers!
David

-- 
t2Mtu4qBote14xSTFee/xnHlXp1eabwHFbehBlktnus=
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